LC Beam Broadening Device with Rotational Misalignment
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Solution Overview
Problem
Liquid crystal beam broadening devices exhibit intensity ripples in their spatial distribution due to unknown aberrations, affecting beam intensity uniformity.
Innovation Solution
Rotational misalignment of LC sandwiches by a few degrees, specifically between 2 to 8 degrees, mitigates the intensity ripples by modifying the electrode orientation patterns between the sandwiches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LC sandwiches are arranged with orthogonal electrode orientation to broaden beam in two directions, then beam broadening capability is improved, but intensity ripples appear in the spatial distribution
Solution Approach 1:
The patent applies asymmetry by intentionally introducing a rotational misalignment between LC sandwiches that deviates from the conventional orthogonal (90-degree) arrangement. This asymmetric configuration disrupts the periodic intensity modulation pattern that causes ripples, thereby improving beam intensity uniformity while preserving the dual-directional broadening capability
Solution Approach 2:
The patent changes the geometric parameter of electrode orientation from the standard orthogonal arrangement to a misaligned configuration with angles between 45-135 degrees (excluding 90 degrees). This parameter modification eliminates the constructive interference that produces intensity ripples while maintaining effective beam broadening in two directions
2Adaptability or versatility
If multiple LC sandwiches are stacked to act on different polarizations, then polarization coverage is improved, but beam intensity uniformity deteriorates due to ripple accumulation
Solution Approach 1:
The patent introduces asymmetric rotational misalignment between stacked LC sandwiches, breaking the symmetry that would otherwise cause ripple patterns to align and accumulate. This asymmetric arrangement ensures that intensity modulations from different sandwiches do not constructively interfere, maintaining uniformity across the stacked configuration
Solution Approach 2:
The patent addresses the ripple problem by introducing a new dimensional parameter - the rotational angle between sandwiches - rather than simply adjusting the number or arrangement of sandwiches in the stacking direction. This angular dimension provides an additional degree of freedom to control intensity distribution while maintaining polarization coverage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly improves beam intensity profile uniformity, ensuring consistent light distribution across the beam aperture.
Implementation Method 1
an LC cell having a homeotropic LC alignment in which the electrodes of the opposed cell substrates are orthogonally arranged
Implementation Method 2
the electric field created by the electrodes on each substrate orients the LC in a direction orthogonal to the extent of the strip electrodes
Implementation Method 3
The upper part of the cell acts on input light to split it into two linear polarizations
Implementation Method 4
the polarization is rotated by 90 degrees that is related to the twist in the LC in the middle of the cell that has been found to cause a rotation in the polarized light
Data Source
AI summary
Liquid crystal light beam broadening devices and their manufacture are described. Beneficial aspects of beam broadening devices employed for controlled illumination and architectural purposes are presented including providing symmetric beam broadening, improving the beam intensity profile, beam divergence preconditioning and improving projected beam intensity uniformity. Both beam control devices having in-plane and homeotropic ground state liquid crystal alignment are presented.